Razor-blade.



11. J. GAISMAN. RAZOR' BLADE. APLIOATION FILED APR.5, 1909.

LGLQS .1M I f1/wc', who@ 76H7? My/7mm, u I 3g) h' @H20/Meg M70 f f? mim Patented Dec. 19, 1911. y

UMTED' srA'rns 'PATENT oFFicE- HENRY J. GAISMAN, OF NEW YORK, N. Y., ASSIGNOR TO AUTO STROP COMPANY, 0F

' NEW YORK, N. Y., A CORPORATION 0F NEW YORK. g f

Razon-BLADE.

Specication of Letters Patent.

Patented Dee. 19, 1911.

Application filed April 5, l19(39. i, Serial No. 487,91?.

a citizen of the United States, and resident* of New York city, borough of Manhattan, in the county of New York and State of New York, have invented certain new and useful Improvements in' Razor-Blades, of which the following is a specication.

The wellknown thin or wafer-like safety razor blades that are sharpened on opposite edges and bent while in use to stien them are usually provided with a plurality of alined holes to receive holding pins and the like, and such blades are customarily tempered throughout to such a high degree that when they are bent or curved in use they are liable to crack or break lengthwise between their opposite cutting edges.

The object of my invention is to providel thin or wafer-like blades with one or more cutting edges which may betempered to the highest degree desired and. yet so arrange said blade that itwill not be liable to crack 'or break between its longitudinal edges when bent or curved, and to this end I provide the blade with the desired temper at its cutting edge or edges' and with a cen- My improvedblade may be made by first' tempering the entire blade, either before or after its cutting edge or edges are sharpened or honed, and then drawing the temper or annealing the blade between such edges, or the steel of which the blade is made may be `tempered on opposite sides along its edge or edges without tempering they intermediate portion, as by covering or protecting such intermediate portion from the effects of heat while the exposed'edge portion or.

portions are being tempered. In such case th'e cutting edge or edges may be formed either before or' after tempering the same.

y Reference is to be had tothe accompany-4 ing drawings forming part hereof, wherein,

Figure 1 is a face view of a razor blade embodying my invention, and- Fig. f2'is a cross section on the line 2, 2, in Fig-1.

The numeral 1 indicates a blade which may be of any suitable shape, and which in the instance illustrated is shown of relativelythin or. wafer-like material, such as steel, having lts opposite edges 1* beveled and sharpened, said blade being shown prol vided with a pluralityl of holes 2 centrally disposed to receive holding devices, such as pins or projections Vof a suitable blade `holder or frame. Blade l is of such characas at 3, the blade is annealed or withoutA temper, or it is tempered as much less as y desired, than the temper given vthe longitudinal edge portions on opposite sides of the portion 3, 'which may be done in the manner before described. formA would be to irst sharpen and temper the blade and then anneal or draw the tem- A preferablev per at-the portion Such portion 3 may A Y be of any suitable width, but as the same coincides with the holes 2 the danger of the' th'e longitudinal portion 'f3 is of less temper than the tempered marginal portions the danger of the blade breaking is reducedor practically eliminated, and thereby the advantage is a'orded that the bladewill I'emain intact and not be liable :for parts of Y the same to shift inf-'its holder, obviating dangers that'would-I rsult from such shift- V l 'fwith my invention. With thin razor? blades made. according to my invention, especially ,those having cutting edges-on opposite sides, such as Wellknown safetyra'zor blades, which are bent while in use bygmeans of opposedcurved,

clamping members between which the blade .is held, the blade may bend and remain set or in acurved condition, Awhich affords the advantage that when 'thevblade has been onceused and then removed from theholder for cleaning, 'the blade-Arnay be replaced in substantially vthe same relation, with" ,the edges presented for use inthe' same position f as before, so that such edges may 'continue' thout holes may also in use in the samelrelation with. respect'to Y :n animee Having now described my invention what I claim is 1. A blade made' of a relatively thin piece of metal having a cutting edge and tempered at said edge, the metal of the blade adj aoent said edge being of less temper than the edge portion to permit the blade to bend back of the edge Without danger of fracture.

y 2. A blade having cutting edges on opposite sides and an intermediate portion between said edges of less temper than said edges to permit the blade to bend between said edges without danger of fracture.

3. A double edged razor blade provided with one or more holes between the edges, a portion ofthe blade between said edges being of less temper than the 'edge portions of the blade.

4. A double edge blade provided with a 'plurality of holes between its cutting edges,

the portion of the blade between said edges and at said holes being of less temper than the edge portions.

5. A double edge blade having a plurality of holes between its cutting edges, a portion of the blade between said edges being annealed.

6. A double edge blade having an intermediate portion annealed between the edges.

7. A razor blade consisting of a strip of metal having cutting edges on its opposite parallel edges, the cutting edges being hardened, the center of the strip between the cutting edges and parallel therewith being of metal softer than the cutting edges but integral therewith.

8. A razor bladeeomprising a strip ofy metal having hardened cutting edges, and having an integral soft strip through the center of the blade to facilitate its bending.

Signed at New York city, in the county of New York, and State of New York, this 31st day of March, A. D. 1909.

HENRY J. @Al SMAN. 

